JP2004515665A - Method for hydrodynamically loading a product web using a water jet and a nozzle beam for generating a liquid jet - Google Patents

Abstract

The nozzle beam provided in the device for generating a liquid jet for jet loading the fibers of the fiber web guided along the beam comprises a beam housing extending over the working width of the fiber web. Two longitudinal holes are machined up and down therein, which are separated from one another by an intermediate wall provided with through holes. The nozzle strips required to generate the liquid jet are mounted liquid-tight in the lower part of the housing and are passed through by the liquid under pressure. In order to allow as much of the needle water to act on the product than in this configuration, the present invention provided two nozzle strips in the housing. At this time, pressurized water must be appropriately supplied to the two nozzle strips. At the same time, this arrangement makes it possible to arrange a greater number of nozzle strips on a single drum and thus a nozzle jet. This is advantageous in terms of the different confounding effects provided by a single nozzle beam.

Description

[0001]
The invention applies liquid at high pressures of up to 1000 bar to the nozzle beam from fine nozzle openings arranged in rows and columns in a nozzle strip extending over the working width or working width of the nozzle beam. A fleece (Vlies), a tissue (Tissue), a textile (Gewebe) or a knitting (Gewirke), which is sprayed against a product web (Warenbahn) which faces forward, is hydrodynamically or hydrodynamically loaded or jetted with a liquid jet. Pertaining to a method for hitting.
[0002]
From U.S. Pat. No. 5,870,807 it is known to arrange rows of nozzle holes very closely next to one another in a nozzle strip, and possibly to provide two rows of holes next to each other, The holes are staggered and distributed throughout the length of the nozzle strip. This enables a water curtain consisting of water jets or water jets arranged one after the other, one after the other, and also avoids linear markings on the product web based on the impressions of the respective water jets. The water jet is formed in a precisely fabricated hole in the nozzle strip, see US Pat. No. 3,403,862.
[0003]
In some use cases, a larger amount of water is advantageous to handle the desired effect on the product web. This is the case, for example, when manufacturing a hole fleece (Lochvliesen) using hydrodynamic confounding (Vernadelung). However, it is not desirable to increase the diameter of the nozzle hole to allow more water to flow. This is because the effect of the water jet is weakened during the confounding and coagulation of the fleece to be performed at the same time.
[0004]
On the other hand, the following cases can be considered. That is, the nozzle jet impinges on the product web directly after one another, but at a greater distance than in two rows of nozzle holes, possibly offset relative to one another in the nozzle strip. In such a case, the distance between two complete nozzle beams that are unavoidably required and arranged next to each other becomes extremely large.
[0005]
It is an object of the present invention to enable a larger volume of liquid or a larger number of nozzle jets to be applied to a product in a closely arranged manner in a conventional nozzle beam with a nozzle strip sealed and supported inside. Is to find a solution. In order to solve this problem, according to the invention, the liquid to be jetted is invariably distributed evenly over the working width of the product web, provided that more than one water jet is successively advanced simultaneously in the conveying direction. Impact on a small area of the product web. This has the advantage that a greater amount of liquid can be simultaneously jetted to one or more impingement points in the product web by multiple water jets of multiple nozzle strips viewed in the forward direction of the product web. is there. In this connection, it is conceivable that more than one water jet is simultaneously applied to a small area of between 1 and 20 cm, preferably 8 cm, of the advancing product web in line in the conveying direction. Collision.
[0006]
This idea can be distinguished from the solution described in US Pat. No. 3,214,819 or US Pat. No. 3,873,255. There is no disclosure of a nozzle beam extending over the working width of the product web. Prior known single nozzles are oriented partly facing each other, whereby water is also injected intensively at one point of the advancing fleece, which is pointwise injected at one point It doesn't mean that you just spray over the entire working width. Even if the nozzle works like a slit and extends over the width, it is impossible to divert that idea to the present invention. The problem here is to generate a fine nozzle jet, which is only possible with the known nozzle beam structures with pressure chambers and pressure distribution chambers. Even if the ideas described in the above two U.S. patents are diverted to the nozzle described in U.S. Pat. No. 5,870,807, which is needed here, the present invention prevents the dimensions of the housing from hindering. The effect due to can not be obtained.
[0007]
The principle idea according to the invention, which gives rise to a plurality of water jets arranged one after the other in the transport direction in the nozzle beam, also provides different effects such as patterns. When the nozzle beam oscillates or oscillates at a predetermined frequency, each nozzle jet presses a line or recess into the product web to form a pattern. Since the water jet flows out of one nozzle beam at a predetermined interval and the nozzle beam reciprocates at a predetermined frequency, two lines are drawn on the product web one after another anyway. Depending on the speed of the product web, the line can also form, for example, a Zoffmester, ie a pattern with a relatively offset or crossed meander line. This corresponds to two water jets flowing out one after another, and naturally also to a double water jet, in which case the nozzle openings are formed side by side into a nozzle strip. I have.
[0008]
The nozzle beam consists of an upper part and a lower part extending over the working width of the web, the upper part being arranged over its entire length a circular pressure chamber in cross section, A liquid under pressure is supplied to the pressure chamber, for example, on the end face side, and a pressure distribution chamber is provided in a lower portion following the intermediate wall, parallel to the pressure chamber, A pressure distribution chamber is connected to the pressure chamber via a liquid through-hole arranged in the intermediate wall, and a nozzle strip is provided in the lower part with a hole for the nozzle in a liquid-tight manner. ing.
[0009]
A nozzle beam of this kind is known from EP-A-0 725 175. This nozzle beam has a simpler construction than the construction described in U.S. Pat. No. 4,096,563 or in DE 220060 or DE 3727843. Therefore, there is an advantage that the expected downtime for maintenance can be reduced. This arrangement ensures an even distribution of the liquid over the length of the nozzle strip.
[0010]
Regarding the circumference of the drum that conveys the product web at the time of confounding, especially when guiding the meandering product web, only a limited circumferential area can be used, and the nozzle beam is arranged over this limited circumferential area. Can be done. However, multiple nozzle beams are required to achieve the desired processing effect. The nozzle beam, when viewed in the circumferential direction, requires a certain space that cannot be reduced, on the basis of which the maximum number of nozzle beams per drum is determined.
[0011]
Furthermore, only a limited amount of liquid can be applied to the product web per nozzle beam. However, this amount is not sufficient in some processing steps, for example making holes in the fleece, in which case the individual fibers are forced around the perimeter of the hole by the large amount of water flowing through the fleece. That is, it must be flushed to the same point on the drum or fleece. In this case, it is impossible to increase the number of nozzle beams in a plurality of drums provided over the entire length of the entire apparatus. This is because it is possible to use only one drum with projections for the holes, as described, for example, in EP 1001064, for producing the holes. is there.
[0012]
These problems can be solved if two nozzle strips with holes for the nozzle holes are provided in the housing forming the nozzle beam, wherein advantageously both nozzle strips are provided. The strips should be arranged closely side by side in the housing of the nozzle beam. Thereby, at least one wall of the nozzle beam, which otherwise would have been arranged side by side, must be fixed in the machine frame at any distance from one another on the basis of the water connection Is omitted. For an optimal construction, both nozzle strips in a single nozzle beam housing should be provided with a pressure chamber and subsequently a pressure distribution chamber, one each for the supply and distribution of liquid. This means that both the pressure distribution chambers and, if necessary, the pressure chambers are arranged closely together in one housing of the nozzle beam. This kind of “Duplex” nozzle beam allows in any case to arrange more nozzle strips over the available circumference of a drum, for example a protruding drum, in other words , More water jets can work.
[0013]
This structure can also affect the circumferential spacing of the water jets impinging on the product web. If the two nozzle strips are closely arranged in the nozzle beam, in each case, apart from the closer spacing to the subsequent water jet curtain, the pressure distribution chambers which are arranged one after the other in each case, Both lines, together with the associated nozzle strips, can also be directed obliquely close to each other in one nozzle beam housing, so that the water jets impinging on the product web are facing each other in the form of arrows. And is arranged to be more closely aligned at the point of impact. The intersection of the two nozzle jets generated by the two nozzle strips in the housing may be on the product itself or on the back of the product. The inclination of the liquid jets, which are oriented so as to close each other in the form of arrows, is adapted only to the diameter of the drum which places the product web directly below the nozzle beam and conveys the product web, It is, of course, possible for the water jet to hit the product web vertically anyway.
[0014]
If the water jets from the two nozzle strips should impinge on the product web in a very close line, or more so, they should only be advantageous for both nozzle strips. A pressure chamber is used in the nozzle beam, and the pressure chamber holes are double-controlled by the respective liquid through-holes.
[0015]
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
[0016]
The nozzle beam (Duesenbalken), also called jet head, consists in principle of a part as described in EP-A-0 725 175. In that regard, it is related to the disclosure of EP-A-0 725 175.
[0017]
The nozzle beam consists of a housing 1 with two longitudinal holes 2,3. The two longitudinal holes 2, 3 are separated from one another by an intermediate wall 4, in which a through-hole 5 communicating the holes 2, 3 is arranged. Opposed to the through-hole, that is to say alongside the other side of the hole 3, a narrower slit 6 is provided for the outflow of liquid. A nozzle beam with this basic structure is still advantageous here. At the end face, water placed under a high pressure of up to 1000 bar flows into a bore 2 serving as a pressure chamber in the upper part of the housing, which flows along the entire nozzle beam. Thus, the pressure is distributed in the pressure distribution chamber 3 arranged in the lower portion of the housing. In the case of the illustrated device, the base portion is fixed to the lower surface of the housing 1 by a number of screws (not shown). In the groove 8 at the base part, the nozzle strip 7 necessary for generating a liquid jet is mounted. Thereby, the liquid jet is ejected from the nozzle beam through a centrally formed slit 9 below the nozzle strip 7 and impinges, for example, on a product web guided on a drum 10.
[0018]
In the case of the nozzle beam shown in FIG. 1, two holes 2, 2 'for pressure chambers and two holes 3, 3' for pressure distribution chambers are machined in the housing 1. In essence, this results in two nozzle beams with all the holes and parts mentioned above being arranged in one housing 1, which can result in a saving of one housing. Means that. Although the new housing shown in FIG. 1 is certainly large in terms of lateral dimensions, it is small compared to the two beams in the prior known construction.
[0019]
Due to the nozzle beam formed in this way, both nozzle strips 7, 7 ′ are arranged closer together as compared to the case of two separate nozzle beams, and are therefore known in the prior art. Compared to the case, more nozzle strips can be arranged with respect to the drum 10, so that more liquid jets generated can be impinged.
[0020]
Thus, the structure shown in FIG. 1 assumes that the product web is guided on a horizontally guided belt. If the web is guided on a drum, the configuration shown in FIG. 2 is preferred, in which the water jets of both nozzle strips 7, 7 'are perpendicular to the product web, even if they are drum-guided. collide. This is possible because the pressure chambers 2, 2 ′ are drilled virtually unchanged, but the two pressure distribution chambers 3 ″, 3 ″ are perforated relatively staggered, so that the through-flow holes 5 ′ , 5 '''and the slits 6'',6''' are directed side by side so as to face each other and close.
[0021]
The nozzle beams shown in FIGS. 1 and 2 can also be used to produce line patterns having various lines that can be individually recognized. Advantageously, the beam 1 should swing back and forth at a given frequency up to 50 Hz, preferably at 20 Hz. The water jets from the two nozzle strips 7, 7 'impinge on the product web based on their distance from one another, as the web advances forward, so that various line patterns are produced when the beam swings. The web can be pressed by a water jet. In addition, nozzle holes or groups of holes may be provided at relatively large intervals by special perforations in the nozzle strip. The perforations can also be started at the ends of the strip at different distances from the outermost end, i.e. the origin position (Nullpunktstellung) can be changed. Furthermore, it is possible to make two different types of confounding with one nozzle beam. The first nozzle strip can give rise to a full confounding of the fleece product, and the second nozzle strip can give a pattern, for example a striped pattern with parallel lines that does not matter what kind. .
[0022]
With regard to the inclination of the water jets, which are directed to close each other in the form of arrows, in order to further enlarge this inclination, as shown in FIG. 3, the parts 6 ″, 3 ′ arranged one after the other, as shown in FIG. , 5 ", 2 and the corresponding 6", 3 ", 5", 2 'lines are arranged in the housing 1 in a suitable arrow shape, whereby A precondition is established that the water jets 11 generated in the nozzle strips 7, 7 'converge at the product on the drum 10 because of the greater possible tilt. Instead of two pressure chambers 2, 2 ', the design shown in FIG. 3 can be replaced by only one pressure chamber, in which only two through-holes 5 ", 5""are provided. It is open. Of course, this is also possible in other embodiments. This allows a greater amount of water to be provided to the same piece of product at the same time using a sharply focused fine water jet of a water beam than was possible in known cases. The method is feasible.
[Brief description of the drawings]
FIG.
FIG. 3 is a cross-sectional view of a “dual” nozzle beam.
FIG. 2
Also shown is a "double" nozzle beam cross-section with nozzle jets directed obliquely toward each other.
FIG. 3
Similarly, a cross-section of a "duplex" nozzle beam having nozzle jets directed diagonally opposite each other, where the nozzle jets merge on the product web.

Claims (23)

A product web advancing liquid at high pressures up to 1000 bar from fine nozzle openings arranged in a row in a row in a nozzle strip extending over the working width of the nozzle beam, in opposition to the nozzle beam; In a method for hydrodynamically loading a fleece, tissue, woven or knitted fabric with a liquid jet, in which the sprayed liquid is distributed evenly over the working width of the product web, provided that A method for hydrodynamically loading a product web using water jets, characterized in that more than two water jets are impinged simultaneously on small areas of the advancing product web in succession in direction. At high pressures of up to 1000 bar, liquid is transferred from the fine nozzle openings, which are arranged in a row in a nozzle strip of the nozzle beam, which are extended over the working width, into a product web advancing face-to-face with the nozzle beam. In a process for hydrodynamically loading a fleece, tissue, fabric or knitting jet with a liquid jet, the jetted liquid is invariably distributed from the nozzle beam evenly over the working width of the product web; Characterized in that more than one water jet is simultaneously impinged on a small area between 1 and 20 cm, preferably 8 cm, of the advancing product web in line in the transport direction. For hydrodynamically loading product webs using water jets. The method according to claim 1, wherein a large quantity of liquid is simultaneously jetted by means of a plurality of water jets from one nozzle beam to a respective impact point of the product web. 3. The method according to claim 1, wherein different patterns such as full entangling and streaking are applied to the product web by a single water beam. 5. The method as claimed in claim 1, wherein the nozzle strip of one nozzle beam is reciprocated, preferably in the longitudinal direction of the nozzle strip, along with the nozzle beam. 6. The method according to claim 5, wherein the movement of the nozzle strip is performed at a speed of 5 to 50 Hz, preferably 20 to 25 Hz. 7. The method according to claim 5, wherein different patterns are impressed on the product web by water jets from the nozzle holes in relation to the speed of the product web advancing. A nozzle beam, preferably for carrying out the method according to one of the claims 1 to 7, wherein the nozzle beam was guided along a beam using a drum or an endless belt. An apparatus for generating a liquid jet for jet-loading the fibers of a web, such as a fibrous web, tissue, woven or knitted, wherein a nozzle beam extends over the working width of the web; The upper part is provided with a pressure chamber, which is circular in cross section, over its entire length, into which the liquid under pressure is supplied, for example on the end face side. Parallel to the pressure chamber, a pressure distribution chamber is provided in the lower part following the intermediate wall, and the pressure distribution chamber is disposed in the pressure chamber and in the intermediate wall. Liquid through hole In the housing (1) forming the nozzle beam, in the form of a nozzle-shaped sheet metal in the lower part which is mounted in a liquid-tight manner with holes for the nozzles in the lower part. A nozzle beam for generating a liquid jet, characterized in that two nozzle strips (7, 7 ') are mounted with holes for nozzle holes. 9. The nozzle beam as claimed in claim 8, wherein the two nozzle strips are arranged closely adjacent to one another in the housing of the nozzle beam. In one nozzle beam housing (1), a pressure chamber (2, 2 ') and a pressure distribution chamber (3, 3') communicating with it are provided in each of the two nozzle strips (7, 7 '). Nozzle beam according to claim 8 or 9, which are arranged correspondingly for the supply and distribution of liquid. 11. The nozzle beam according to claim 10, wherein both pressure chambers and pressure distribution chambers are arranged in close proximity to one housing (1) of the nozzle beam. In the nozzle beam housing (1) of the nozzle beam, only one pressure chamber (2 ''), but two pressure distribution chambers (3 '', 3 '' '') are provided with correspondingly arranged two nozzle strips 10. The nozzle beam according to claim 8, wherein the nozzle beam is arranged with (7, 7 '). 10. The nozzle according to claim 8, wherein in the nozzle beam housing of the nozzle beam, only one pressure chamber and only one pressure distribution chamber are arranged with two nozzle strips correspondingly arranged therewith. beam. The lines of the pressure chambers and the pressure distribution chambers, which are in each case arranged one after the other, are oriented parallel to one another in one nozzle beam housing, together with the associated through-holes, The nozzle strips and the nozzle strip bearings are also inclined and directed to close one another, whereby the water jets impinging on the product web are directed to close one another in a generally arrow-shaped manner, 14. The nozzle beam according to claim 8, wherein the nozzle beam is arranged further closer to the collision point. If necessary, both lines of pressure chambers and pressure distribution chambers (4 '', 6 '' ''; 4 '', 6 '') which are arranged one after the other are connected to the associated nozzle strip (7, 7). ') Together with one nozzle beam housing (1) inclined and directed to close one another so that the water jets impinging on the product web are directed to close one another in the form of an arrow. 14. The nozzle beam according to any one of claims 8 to 13, wherein the nozzle beam is arranged closer to the collision point. The nozzle jets from both adjacent nozzle strips (7, 7 ') in one nozzle beam merge on the product web based on the orientation of the nozzle strips (7, 7') in the nozzle beam (FIG. 3). ), The nozzle beam according to claim 15. 16. The nozzle beam of claim 15, wherein the nozzle jets of both adjacent nozzle strips in one nozzle beam merge at the back of the product web based on the orientation of the nozzle strip in the nozzle beam. The inclination of the liquid jets, which are directed to close each other in the form of arrows, causes the product web to be placed directly below the nozzle beam with the two nozzle strips and to transport the product web on the drum (10). 16. The nozzle beam according to claim 15, adapted to a diameter such that the water jet impinges vertically on the product web (Fig. 2). Apparatus according to any one of claims 8 to 13 for carrying out a method according to any one of claims 5 to 7, wherein the nozzle strip is provided with nozzle holes. Are spaced relatively large from each other by 1 to 20 mm. 20. The plurality of nozzle holes are arranged directly next to one another, provided that the groups of nozzle holes are spaced apart from one another by a relatively large distance of 1 to 20 mm. The described device. 21. Apparatus according to any one of claims 8 to 13, and 19, 20, wherein the nozzle holes of the nozzle strip, which are arranged one after the other in the transport direction, are arranged offset and side by side. The first nozzle holes of the nozzle strip are equally spaced apart except that the lateral original position of the nozzle holes is laterally offset with respect to the nozzle holes of the subsequent nozzle strip. 23. The device of claim 21, wherein Two different nozzle strips are provided for one nozzle beam, these different nozzle strips being, for example, strips with closely arranged nozzle holes for planar confounding; 23. The strip as claimed in claim 19, wherein the strip is provided with nozzle holes which are machined into the strip at a relatively large distance from one another in order to produce a line formation in the material transport direction. Item.